adverb, adverb taking the 'to' particle, noun or participle which takes 'suru', noun which may take the genitive case particle 'no', na-adjective
Describes physical instability: a loose tooth, a shaky table, or an unsteady walk. Often used with する or と.
歯がグラグラする。
My tooth is loose.
地震で建物がグラグラと揺れた。
The building shook unsteadily in the earthquake.
adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
wavering; dithering; indecisive
Used for mental or emotional instability: unable to make up one's mind, or a resolve that is faltering. Often with する or と.
彼の決心はまだグラグラしている。
His resolve is still wavering.
どの大学に行くかでグラグラ迷っている。
I'm dithering over which university to go to.
adverb, adverb taking the 'to' particle
boiling up; bubbling vigorously
Describes liquid boiling with large, rolling bubbles. Less common than the physical/mental instability senses.
鍋の湯がグラグラと沸いている。
The water in the pot is boiling up vigorously.
adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
Describes a sensation of dizziness or lightheadedness, often from illness or intoxication. Related to くらくら.
See also: くらくら
熱で頭がグラグラする。
My head feels dizzy from the fever.